Soil mobility of surface applied polyaromatic hydrocarbons in response to simulated rainfall

Revitt, D. Mike and Balogh, Tamas and Jones, Huw (2014) Soil mobility of surface applied polyaromatic hydrocarbons in response to simulated rainfall. Environmental Science and Pollution Research, 21 (6). pp. 4209-4219. ISSN 0944-1344

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Abstract

Polyaromatic hydrocarbons (PAHs) are emitted from a variety of sources and can accumulate on and within surface soil layers. To investigate the level of potential risk posed by surface contaminated soils, vertical soil column experiments were conducted to assess the mobility, when leached with simulated rainwater, of six selected PAHs (naphthalene, phenanthrene, fluoranthene, pyrene, benzo(e)pyrene and benzo(ghi)perylene) with contrasting hydrophobic characteristics and molecular weights/sizes. The only PAH found in the leachate within the experimental period of 26 days was naphthalene. The lack of migration of the other applied PAHs were consistent with their low mobilities within the soil columns which generally parallelled their log Koc values. Thus only 2.3% of fluoranthene, 1.8% of pyrene, 0.2% of benzo(e)pyrene and 0.4% of benzo(ghi)perylene were translocated below the surface layer. The PAH distributions in the soil columns followed decreasing power relationships with 90% reductions in the starting levels being shown to occur within a maximum average depth of 0.94 cm compared to an average starting depth of 0.5 cm. A simple predictive model identifies the extensive time periods, in excess of 10 years, required to mobilise 50% of the benzo(e)pyrene and benzo(ghi)perylene from the surface soil layer. Although this reduces to between 2 and 7 years for fluoranthene and pyrene, it is concluded that the possibility of surface applied PAHs reaching and contaminating a groundwater aquifer is unlikely.

Item Type: Article
Research Areas: A. > School of Science and Technology > Natural Sciences
Item ID: 14568
Notes on copyright: Already in repository but Post-print version now included as permitted by publisher 12 months after publication (as indicated in Sherpa/Romeo)
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Depositing User: Mike Revitt
Date Deposited: 20 Apr 2015 16:05
Last Modified: 07 Sep 2018 17:12
URI: http://eprints.mdx.ac.uk/id/eprint/14568

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